The amount of a Ras-related C3 botulinum toxin substrate 3 (human) when measured in cerebrospinal fluid. The trait is level of Ras-related C3 botulinum toxin substrate 3 (human) in cerebrospinal fluid (Ontology of Biological Attributes identifier OBA_2058247). Also known as: cerebrospinal fluid Ras-related C3 botulinum toxin substrate 3 (human) amount.